What’s your definition of “most?” When I hear that word used by someone else, I typically translate it to mean “the majority” or “a big chunk” or “50.1% or greater.”
If that’s the way you’re using the word, then I’d simply ask where’s the data to support your claim that a minimum of half of all warlocks in arena are fotm rerollers? Or is it just conjecture, a “gut feel” kinda thing?